far infrared ray
infrared ray light which is invisible light to human eyes. it has distinct heat radiation, so its physical characteristics is same that visible light . due to the infrared ray located in the outside of visible light, so we call it as infrared ray. the range of infrared ray wavelength between 0.75~1000 millimeter. and the far infrared ray (in 6~15millimeter) has import effect especially for human heath , by the way :the ir led strip is a kind of infrared ray production. the far infrared ray can improvement of cycle system of human, the scientist shall call it is “life ray”.